Expandable display rack frame



FIG. 1 is a perspective view of an expandable display rack frame showing my new design; portions shown broken away to indicate indeterminate length; the broken lines illustrate environmental structure and form no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view the right side being a mirror image thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for an expandable display rack frame, substantially as shown and described. 